In zero gravity, a candle's flame is round and blue.
16
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Most dust particles in your house come from dead skin.
48
Scientists aren't sure what color dinosaurs were.
312
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
Each day, up to 150 species of life become extinct.
-23
Pumice is the only rock that floats on water.
14
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18